Class 7 Science MCQs - Chapter 17
Physical and Chemical Changes Quiz Questions & Answers PDF Download - 19
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The Physical and chemical changes Quiz Questions and Answers PDF (physical and chemical changes Quiz PDF e-Book) download Ch. 17-19 to learn Grade 7 Science Course. Solve Making Ammonia MCQs PDF, Physical and Chemical Changes Quiz Questions and Answers to study online school courses. The Physical and Chemical Changes Quiz App Download: Free learning app for making ammonia, solids liquids and gases, iron and sulphur, burning fuels test prep for online school and college.
The Quiz: Nitrogen is obtained from; "Physical and Chemical Changes" App (iOS, Android) with answers: Liquefied air; Gaseous air; Solidified air; Air spaces in soil; to study online school courses. Study Making Ammonia MCQ Questions, download Amazon eBook (Free Sample) for online school courses.
Physical and Chemical Changes Exam Questions and Answers PDF Download: Test 19
Nitrogen is obtained from
- gaseous air
- liquefied air
- solidified air
- air spaces in soil
The reason of low density of gases is
- number of particles per unit area
- number of particles per unit volume
- mass per unit area
- mass per unit volume
The reaction that gives out heat, while taking place is known as
- exothermic reaction
- endothermic reaction
- reversible reaction
- substitution reaction
The 'volume' of gases is
- indefinite
- definite
- dependent
- reduced
The compounds made up of hydrogen and carbon are known as
- carbohydrates
- hydrocarbons
- alkanes
- alkenes
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